Well I'm also trying to get the achievement, but also trying to make use of the exp to be earned from it as well as behests are excellent exp. So I understand them wanting the achievement, but that doesn't mean they need to up the difficulty and not help, or waste the exp by stealing all the claims.

Any time I ran across a lower level when I was doing some of the behests at 50, I waiting for the other to claim before I killed, so the xp didn't get wasted. But even when I ask these people to let me get claim, many of them don't listen.